ON PRECIPITATION EFFECTS OF ALUMINUM, LANTHANUM, IRON(III), AND THORIUM PHOSPHATES

Journal Article · Mon Apr 01 00:00:00 EST 1963 · Kolloid-Zeitschrift (West Germany)

DOI:https://doi.org/10.1007/BF01499905· OSTI ID:4104636

Matijevic, E; Milic, I

Typical precipitation curves of metal phosphates were obtained using the turbidimetric technique for: Al(NO/sub 3/)/sub 3/K/sub 3/PO/sub 4/, Al(NO/sub 3/)/ sub 3/ -KH/sub 2/PO/sub 4/, Al(NO/sub 3/)/sub 3 / -- NaH/sub P/O/sub 4/, FeCl/sub 3/ -K/sub 3/PO/sub 4/, FeCl/sub 3/ -- (NH/sub 4/)/sub 2/HPO/sub 4/, FeCl/sub 3/ -- K/ sub 2/HPO/sub 4/, FeCl/sub 3/ --KH/sub 2/PO/sub 4/, FeCl/sub 3/ -- NaH/sub 2/ PO/sub 4/, La(NO/sub 3/)/sub 3/ -- K/sub 3/PO/sub 4/, L a(NO/sub 3/)/sub 3/ -- K/ sub 2/HPO/sub 4/, La(NO/sub 3/)/sub 3/ - KH/sub 2/PO/sub 4/, La(NO/sub 3/)/sub 3/ -- NaH/su b 2/PO/sub 4/, and Th(NO/sub 3/)/sub 4/K/sub 2/HPO/sub 4/. The curves indicate concentration ranges of phosphate precipitation and of complex solubility. Precipitation curves of La phosphates show distinct differences from analogous curves for Al and Fe(III) phosphates. In curves obtained when La(NO/ sub 3/)/sub 3/ and K/sub 3/PO/sub 4/ served as precipitating components, there is a minimum in the equivalent range and 2 maxima develop, one on each end of the curve, that is at the high excess of either of the precipitants. The minimum is caused by the formation of relatively stable colloidal precipitates, and the 2 maxima are apparently the concentration maxima. The drop in turbidity at high excess concentration of either precipitating component may indicate a tendency for fornration of soluble La complex species. Similar results were obtained using primary and secondary phosphates and La nitrate. The tendency of La to form complexes with phosphates is considerably smaller than in the case of Al and Fe(III) ions. Thorium phosphates form jellylike colloidal precipitates when prepared in higher concentrations, so attempts were made to obtain the typical precipitation curves for Th phosphates in low concentrations. Several such curves using K/sub 2/HPO/sub 4/ as the phosphate component are shown. (TCO)

• Research Organization: Univ. of Zagreb
• Sponsoring Organization: USDOE
• NSA Number: NSA-18-012095
• OSTI ID: 4104636
• Journal Information: Kolloid-Zeitschrift (West Germany), Vol. Vol: 188; Other Information: Orig. Receipt Date: 31-DEC-64
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMISTRY
ALUMINUM NITRATES
ALUMINUM PHOSPHATES
AMMONIUM COMPOUNDS
CHEMICAL REACTIONS
COLLOIDS
DIAGRAMS
IRON CHLORIDES
IRON PHOSPHATES
LANTHANUM NITRATES
LANTHANUM PHOSPHATES
PHOSPHATES
POTASSIUM PHOSPHATES
PRECIPITATION
PREPARATION
QUALITATIVE ANALYSIS
QUANTITY RATIO
SODIUM PHOSPHATES
SOLUBILITY
STABILITY
THORIUM NITRATES
THORIUM PHOSPHATES